EP0404867A1 - Magnesium oxide in fine powder form and its use - Google Patents
Magnesium oxide in fine powder form and its useInfo
- Publication number
- EP0404867A1 EP0404867A1 EP89909119A EP89909119A EP0404867A1 EP 0404867 A1 EP0404867 A1 EP 0404867A1 EP 89909119 A EP89909119 A EP 89909119A EP 89909119 A EP89909119 A EP 89909119A EP 0404867 A1 EP0404867 A1 EP 0404867A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnesium oxide
- oxide according
- substance
- particles
- fine powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 32
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000000843 powder Substances 0.000 title claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000011164 primary particle Substances 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 claims abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920000620 organic polymer Polymers 0.000 claims description 2
- 125000002524 organometallic group Chemical group 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 235000003441 saturated fatty acids Nutrition 0.000 claims description 2
- 150000004671 saturated fatty acids Chemical class 0.000 claims description 2
- 150000004756 silanes Chemical class 0.000 claims description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 claims description 2
- 150000004670 unsaturated fatty acids Chemical class 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims 1
- 238000004438 BET method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/053—Fine ceramics
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
- C01F5/10—Magnesia by thermal decomposition of magnesium compounds by thermal decomposition of magnesium chloride with water vapour
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Silicon Compounds (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Un oxyde de magnésium sous forme d'une poudre fine que l'on peut utiliser pour produire des céramiques de haute densité a une teneur en MgO supérieure à 95 % en poids, de préférence supérieure à 98 % en poids, des particules de dimensions inférieures à 15 mum, une superficie spécifique inférieure à 20 m2/g selon la méthode B.E.T. et une valeur statistique moyenne du facteur de forme granulométrique des particules primaires comprise entre 1 et 1,5. Les particules sont enrobées d'une substance hydrophobe tensio-active.A magnesium oxide in the form of a fine powder which can be used to produce high density ceramics has an MgO content of greater than 95% by weight, preferably greater than 98% by weight, smaller particle sizes at 15 mum, a specific surface area of less than 20 m2 / g according to the BET method and an average statistical value of the particle size form factor of the primary particles of between 1 and 1.5. The particles are coated with a surface-active hydrophobic substance.
Description
I I.
Magnesiumoxid in Form eines feinen Pulvers und seine VerwendungMagnesium oxide in the form of a fine powder and its use
Gegenstand der Erfindung ist ein Magnesiumoxid mit einemThe invention relates to a magnesium oxide with a
MgO-Gehalt > 95 Gew.-%, vorzugsweise > 98 Gew.-%, in Form eines feinen Pulvers mit einer Teilchengröße < 15 ym und einer spezifischen Oberfläche < 20 m2/g, bestimmt nach BET aus der Stickstoffadsorptionsisotherme.MgO content> 95% by weight, preferably> 98% by weight, in the form of a fine powder with a particle size <15 μm and a specific surface area <20 m 2 / g, determined according to BET from the nitrogen adsorption isotherm.
Um bei der Herstellung von Keramiken, z.B. von feuerfesten Erzeugnissen, eine hohe Dichte zu erzielen, ist es erwünscht, die Hohlräume zwischen den Körnern der Matrix mit sehr feinen Teilchen, d.h. mit einem Mikropulver, auszufüllen. Ein Material, das sich dabei etwa hinsichtlich der Feuerfestigkeit besonders eignet, ist ein Mikropulver auf der Grundlage von Magnesiumoxid hoher Reinheit.In order to manufacture ceramics e.g. of refractory products to achieve high density, it is desirable to fill the voids between the grains of the matrix with very fine particles, i.e. with a micropowder. A material that is particularly suitable for fire resistance is a micropowder based on high-purity magnesium oxide.
Es ist Aufgabe der Erfindung, ein Magnesiumoxid-It is an object of the invention to use a magnesium oxide
Mikropulver zu schaffen, das sich zum Ausfüllen der Hohlräume in einer Keramikmatrix und zur Herstellung hochdichterTo create micropowder that can be used to fill the cavities in a ceramic matrix and to produce high density
Keramiken eignet, ohne jedoch auf diese Anwendungsfälle beschränkt zu sein.Ceramics are suitable, but are not limited to these applications.
Nach der Erfindung ist ein derartiges Magnesiumoxid- Mikropulver dadurch gekennzeichnet, daß es einen statistischen Mittelwert des Kornformfaktors der Primär¬ teilchen zwischen 1 und 1,5 aufweist und die Teilchen eine Beschichtung aus einer hydrophobierenden Substanz besitzen. Der Kornformfaktor K ist durch die BeziehungAccording to the invention, such a magnesium oxide micropowder is characterized in that it has a statistical mean value of the grain shape factor of the primary particles between 1 and 1.5 and the particles have a coating of a hydrophobizing substance. The grain shape factor K is due to the relationship
K ü2 K ü 2
4 ιuι F4 ι u ι F
definiert, wobei U den Teilchenumfang und F die Teilchenfläche bedeutet, jeweils bezogen auf den Aufriß, des Teilchens, wie er unter dem Mikroskop erscheint. Unter "Primärteilchen" sind die dispergierten, nicht agglomerierten Teilchen zu verstehen. Der Kornformfaktor K, eine dimensionslose Zahl, ist 1 im Falle eines exakt kugelförmigen Teilchens und ist umso größer, je stärker die Form des Teilchens von der Kugelform abweicht. Der Kornformfaktor mit einem statistischen Mittelwert der Verteilungskurve im Bereich zwischen 1 und 1,5 definiert demnach Primärteilchen von annähernd kugelförmiger Gestalt.
Als hydrophobierende Substanzen, mit denen die Magnesiumoxidteilchen nach der Erfindung beschichtet oder überzogen sind, eignen sich oberflächenaktive Stoffe, insbesondere ungesättigte oder gesättigte Fettsäuren oder deren Derivate, organometallische Substanzen - wie Silane, Titanate, Zircoalu inate, Metallseifen - oder Silikone oder organische Polymere.defined, where U is the particle size and F is the particle area, each based on the elevation of the particle as it appears under the microscope. “Primary particles” are understood to mean the dispersed, non-agglomerated particles. The grain shape factor K, a dimensionless number, is 1 in the case of an exactly spherical particle and is larger the more the shape of the particle deviates from the spherical shape. The grain shape factor with a statistical mean of the distribution curve in the range between 1 and 1.5 therefore defines primary particles of approximately spherical shape. Suitable hydrophobing substances with which the magnesium oxide particles are coated or coated according to the invention are surface-active substances, in particular unsaturated or saturated fatty acids or their derivatives, organometallic substances - such as silanes, titanates, zircoaluminates, metal soaps - or silicones or organic polymers.
Durch diese Substanzen wird die innere Reibung des Magnesiumoxid-Mikropulvers herabgesetzt und die Teilchen erhalten im Zusammenwirken mit dem angewendeten Bindemittel ein hohes Maß an Beweglichkeit, so daß bei der Formgebung der Keramik ein hoher Verdichtungsgrad erreicht wird.These substances reduce the internal friction of the magnesium oxide micropowder and, in cooperation with the binder used, give the particles a high degree of mobility, so that a high degree of compaction is achieved when the ceramic is shaped.
Das erfindungsgemäße Magnesiumoxid weist im allgemeinen einen Gehalt von 0,1 bis 10 Gew.-% an hydrophobierender Substanz auf.The magnesium oxide according to the invention generally has a content of 0.1 to 10% by weight of hydrophobicizing substance.
Durch diese Beschichtung wird der Dispergierungsgrad des Magnesiumoxid-Mikropulvers erhöht, d.h. das erfindungsgemäße Mikropulver besteht neben isoliert vorliegenden Primär¬ teilchen nur aus relativ kleinen Agglomeraten von Primär- teilchen. In diesem Sinne weist das Pulver eine Teilchengröße < 15 μm, vorzugsweise von 0,2 bis 15 μm auf. Dabei liegt die Größe der Primärteilchen bevorzugt im Bereich von 0,2 bis 2 μm.This coating increases the degree of dispersion of the magnesium oxide micropowder, i.e. the micropowder according to the invention consists, in addition to isolated primary particles, only of relatively small agglomerates of primary particles. In this sense, the powder has a particle size <15 μm, preferably from 0.2 to 15 μm. The size of the primary particles is preferably in the range from 0.2 to 2 μm.
Die spezifische Oberfläche des Mikropulvers, welche nach BET aus der Stickstoffadsorptionsisotherme bestimmbar ist, soll nicht allzu hoch sein; sie liegt beim erfindungsgemäßen Magnesiumoxid unter 20 m /g, vorzugsweise im Bereich von 2 bis 7 m2/g.The specific surface area of the micropowder, which can be determined according to BET from the nitrogen adsorption isotherm, should not be too high; in the magnesium oxide according to the invention it is below 20 m / g, preferably in the range from 2 to 7 m 2 / g.
Ein für die Zwecke der Erfindung besonders geeignetes Magnesiumoxidpulver kann durch Pyrohydrolyse einer Magnesiumchloridlösung gewonnen werden, wobei zur thermischen Zersetzung ein Sprühröstofen eingesetzt werden kann. Das dabei erhaltene Pulver wird sodann mit der hydrophobierenden Substanz beschichtet. Einige der durch die Erfindung zu erzielenden Vorteile werden in den nachstehenden Beispielen aufgezeigt.
Beispiel 1:A magnesium oxide powder which is particularly suitable for the purposes of the invention can be obtained by pyrohydrolysis of a magnesium chloride solution, it being possible to use a spray roasting furnace for the thermal decomposition. The powder obtained is then coated with the hydrophobicizing substance. Some of the advantages to be achieved by the invention are shown in the examples below. Example 1:
Durch Sprührösten einer gereinigten Magnesiumchloridlösung wurde ein Magnesiumoxidpulver A erhalten. Ein Teil dieses Materials wurde längere Zeit (6 Stunden) mit einer Metallseife gemischt und dabei wurde das beschichtete Magnesiumoxidpulver B erhalten. Die Eigenschaften dieser beiden Materialien A und B sind einander in der folgenden Tabelle 1 gegenübergestellt:A magnesium oxide powder A was obtained by spray-roasting a purified magnesium chloride solution. Part of this material was mixed with a metal soap for a long time (6 hours), and thereby the coated magnesium oxide powder B was obtained. The properties of these two materials A and B are compared in Table 1 below:
Tabelle 1Table 1
In der Körnungsanalyse geben die Werte d30r dso und d* 0 jene Teilchendurchmesser an, bei denen 30, 50 bzw. 70 % des Materials kleiner als der angegebene Wert sind.In the grain size analysis, the values d 30 rd so and d * 0 indicate those particle diameters in which 30, 50 and 70% of the material are smaller than the specified value.
Der Hydratationsgrad wurde bestimmt, nachdem die Proben in einem Klimaschrank 48 Stunden lang bei einer Temperatur von 40*C einer Atmosphäre mit 95 % relativer Luftfeuchtigkeit ausgesetzt worden waren. Der Hydratationsgrad wurde aus der Gewichtszunahme infolge von Aufnahme von Wasser bestimmt, wobei ein Hydratationsgrad von 100 % der vollständigen Umsetzung des MgO zu Mg(OH)2 entspricht.
Beispiel 2:The degree of hydration was determined after the samples had been exposed in an environmental cabinet for 48 hours at a temperature of 40 ° C. in an atmosphere with 95% relative air humidity. The degree of hydration was determined from the weight gain due to the absorption of water, a degree of hydration of 100% corresponding to the complete conversion of the MgO to Mg (OH) 2 . Example 2:
Es wurden Steinmischungen aus 10 Gew.-% unbehandeltem Magnesiumoxidpulver A bzw. 10 Gew.-% beschichtetem Magnesiumoxidpulver B und jeweils 90 Gew.-% Sintermagnesia in einer Korngröße unter 3 mm, gewonnen aus eisenarmem Naturmagnesit, hergestellt. Die Mischungen wurden zu Steinen gepreßt und diese wurden bei einer Temperatur von 1850*C gebrannt. Tabelle 2 zeigt die an den Steinen ermittelten Prüfwerte.Stone mixtures were produced from 10% by weight of untreated magnesium oxide powder A or 10% by weight of coated magnesium oxide powder B and in each case 90% by weight of sintered magnesia with a grain size of less than 3 mm, obtained from low-iron natural magnesite. The mixtures were pressed into stones and these were fired at a temperature of 1850 ° C. Table 2 shows the test values determined on the stones.
Tabelle 2Table 2
Beispiel 3: Aus 100 Gew.-% Magnesiumoxidpulver A bzw. 100 Gew.-% Magnesiumoxidpulver B wurden Formkörper hergestellt und bei einer Temperatur von 1600*C gebrannt. Tabelle 3 zeigt die ermittelten Prüf erte.Example 3: Shaped articles were produced from 100% by weight of magnesium oxide powder A or 100% by weight of magnesium oxide powder B and fired at a temperature of 1600 ° C. Table 3 shows the test results.
Tabelle 3Table 3
Claims
1. Magnesiumoxid mit einem MgO-Gehalt > 95 Gew.-%, vorzugsweise > 98 Gew.-%, in Form eines feinen Pulvers mit einer Teilchengröße < 15 μm und einer spezifischen Oberfläche < 20 m2/g, bestimmt nach BET aus der Stickstoff- adsorptionsisotherme, dadurch gekennzeichnet, daß es einen statistischen Mittelwert des Kornformfaktors der Primärteilchen zwischen 1 und 1,5 aufweist und die Teilchen eine Beschichtung aus einer hydrophobierenden Substanz besitzen.1. Magnesium oxide with a MgO content> 95 wt .-%, preferably> 98 wt .-%, in the form of a fine powder with a particle size <15 microns and a specific surface area <20 m 2 / g, determined according to BET from the Nitrogen adsorption isotherm, characterized in that it has a statistical mean of the grain shape factor of the primary particles between 1 and 1.5 and the particles have a coating of a hydrophobic substance.
2. Magnesiumoxid nach Anspruch 1, dadurch gekennzeichnet, daß es eine Teilchengröße von 0,2 bis 15 μ aufweist.2. Magnesium oxide according to claim 1, characterized in that it has a particle size of 0.2 to 15 μ.
3. Magnesiumoxid nach Anspruch 2, dadurch gekennzeichnet, daß es eine Größe der Primärteilchen von 0,2 bis 2 μm aufweist.3. Magnesium oxide according to claim 2, characterized in that it has a size of the primary particles of 0.2 to 2 microns.
4. Magnesiumoxid nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es eine spezifische Oberfläche von 2 bis 7 m2/g besitzt.4. Magnesium oxide according to one of claims 1 to 3, characterized in that it has a specific surface area of 2 to 7 m 2 / g.
5. Magnesiumoxid nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß es durch Pyrohydrolyse einer Magnesiumchloridlösung gewonnen ist.5. Magnesium oxide according to one of claims 1 to 4, characterized in that it is obtained by pyrohydrolysis of a magnesium chloride solution.
6. Magnesiumoxid nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die hydrophobierende Substanz aus einem oberflächenaktiven Stoff, insbesondere aus ungesättigten oder gesättigten Fettsäuren oder deren Derivaten, organometallischen Substanzen - wie Silanen, Titanaten, Zircoaluminaten, Metallseifen - oder Silikonen oder organischen Polymeren besteht.6. Magnesium oxide according to one of claims 1 to 5, characterized in that the hydrophobizing substance from a surface-active substance, in particular from unsaturated or saturated fatty acids or their derivatives, organometallic substances - such as silanes, titanates, zircoaluminates, metal soaps - or silicones or organic polymers consists.
7. Magnesiumoxid nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß es einen Gehalt von 0,1 bis 10 Gew.-% hydrophobierender Substanz aufweist.7. Magnesium oxide according to one of claims 1 to 6, characterized in that it has a content of 0.1 to 10 wt .-% hydrophobicizing substance.
8. Verwendung des mit einer Beschichtung aus hydrophobierender Substanz versehenen Magnesiumoxidpulvers nach einem der Ansprüche 1 bis 7 zur Herstellung hochdichter Keramiken. 8. Use of the magnesium oxide powder provided with a coating of hydrophobizing substance according to one of claims 1 to 7 for the production of high-density ceramics.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT2006/88A AT392464B (en) | 1988-08-10 | 1988-08-10 | MAGNESIUM OXIDE IN THE FORM OF A FINE POWDER AND ITS USE |
| AT2006/88 | 1988-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0404867A1 true EP0404867A1 (en) | 1991-01-02 |
Family
ID=3525806
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89909119A Pending EP0404867A1 (en) | 1988-08-10 | 1989-08-03 | Magnesium oxide in fine powder form and its use |
| EP89890206A Expired - Lifetime EP0354896B1 (en) | 1988-08-10 | 1989-08-03 | Magnesium oxide micropowder and its use |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89890206A Expired - Lifetime EP0354896B1 (en) | 1988-08-10 | 1989-08-03 | Magnesium oxide micropowder and its use |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US5106608A (en) |
| EP (2) | EP0404867A1 (en) |
| JP (1) | JPH064487B2 (en) |
| KR (1) | KR900701660A (en) |
| AT (2) | AT392464B (en) |
| AU (1) | AU619885B2 (en) |
| BR (1) | BR8907050A (en) |
| CA (1) | CA1334156C (en) |
| DE (1) | DE58904128D1 (en) |
| ES (1) | ES2040503T3 (en) |
| WO (1) | WO1990001460A1 (en) |
| ZA (1) | ZA896027B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT398967B (en) * | 1992-03-10 | 1995-02-27 | Veitsch Radex Ag | METHOD FOR PRODUCING A FINE-PART OXIDE POWDER |
| JPH0656506A (en) * | 1992-06-05 | 1994-03-01 | Veitscher Magnesitwerke Ag | Production of ceramic material and its molding using finely powdered fire-proofing oxide |
| US5569684A (en) * | 1994-03-03 | 1996-10-29 | Takita Patent & Engineering | Heat conductive silicone rubber composition |
| EP0807092B1 (en) * | 1995-01-31 | 2001-04-11 | Robert Bosch Gmbh | Method of producing ceramic powders with a surface which is made hydrophobic and their use |
| DE19547183A1 (en) * | 1995-01-31 | 1996-08-01 | Bosch Gmbh Robert | Ceramic powders with a hydrophobic surface and their manufacture and use |
| DE19502891A1 (en) * | 1995-01-31 | 1996-08-01 | Bosch Gmbh Robert | Molding compound |
| US6179897B1 (en) | 1999-03-18 | 2001-01-30 | Brookhaven Science Associates | Method for the generation of variable density metal vapors which bypasses the liquidus phase |
| WO2001030699A1 (en) * | 1999-10-25 | 2001-05-03 | Nedmag Industries Mining & Manufacturing B.V. | Magnesium oxide, a mixture of metal oxides, methods for preparation thereof and the use of the materials as frac proppant |
| WO2005046830A2 (en) * | 2003-11-12 | 2005-05-26 | Watts Regulator Co. | Zero waste reverse osmosis water filtering |
| JP5773110B2 (en) * | 2013-05-24 | 2015-09-02 | 堺化学工業株式会社 | Magnesium oxide particles, method for producing magnesium oxide particles, resin composition, and molded article, adhesive or grease using the resin composition |
| EP3126289B1 (en) * | 2014-04-01 | 2023-06-07 | Purac Biochem bv | Thermal decomposition of magnesium chloride |
| JP6739627B2 (en) * | 2017-03-28 | 2020-08-12 | 宇部マテリアルズ株式会社 | Coated magnesium oxide particles, method for producing the same, and thermally conductive resin composition |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT150622B (en) * | 1935-01-10 | 1937-09-10 | Magnesit Ind Aktien Ges | Process for the production of temperature change resistant magnesite bricks. |
| BE755184A (en) * | 1969-08-25 | 1971-02-01 | Oesterr Amerikan Magnesit | REFRACTORY FIRED MAGNESITE BRICK, AND PROCESS FOR ITS MANUFACTURING |
| NL174953C (en) * | 1970-11-24 | 1984-09-03 | Degussa | METHOD FOR HYDROPHOBICIZING METAL OR SILICON OXIDES |
| AT352081B (en) * | 1977-08-22 | 1979-08-27 | Veitscher Magnesitwerke Ag | PROCESS FOR THE LARGE-SCALE PRODUCTION OF METAL OXIDES, IN PARTICULAR MAGNESIUM OXIDE, AND DEVICE FOR CARRYING OUT THE PROCESS |
| US4298379A (en) * | 1980-01-31 | 1981-11-03 | The Hanna Mining Company | Production of high purity and high surface area magnesium oxide |
| AT376416B (en) * | 1981-06-05 | 1984-11-26 | Veitscher Magnesitwerke Ag | METHOD FOR ADAPTING FIRE-RESISTANT MOLDED BODIES WITH APPROXIMATELY VERTICAL MATCHING SURFACES IN HOT OVEN LININGS AND FIRE-RESISTANT MEASURES FOR IMPLEMENTING THE METHOD |
| JPS59227765A (en) * | 1983-06-04 | 1984-12-21 | 科学技術庁金属材料技術研究所長 | Manufacture of ceramic super fine particle |
| JPS60166260A (en) * | 1984-02-10 | 1985-08-29 | 旭硝子株式会社 | Mgo sintered body for insulator substrate and manufacture |
| JPS60200824A (en) * | 1984-03-27 | 1985-10-11 | Shin Nippon Kagaku Kogyo Co Ltd | Magnesia and its production |
| AT382142B (en) * | 1984-12-17 | 1987-01-12 | Ruthner Michael Johann Dipl In | METHOD AND DEVICE FOR PRODUCING CERAMIC POWDERS BASED ON ONE AND / OR MULTI-COMPONENT METAL OXIDS, AND MIXTURES THEREOF |
| DD236081A1 (en) * | 1985-04-11 | 1986-05-28 | Kali Veb K | METHOD FOR PRODUCING A BRIKETTING-PROOF MAGNESIUM OXIDE POWDER |
| JPS61270213A (en) * | 1985-05-27 | 1986-11-29 | Shin Nippon Kagaku Kogyo Co Ltd | Modified magnesia and production thereof |
| JPH0776126B2 (en) * | 1986-06-03 | 1995-08-16 | 神島化学工業株式会社 | Method for manufacturing magnesia sintered body |
| JPS6345117A (en) * | 1986-08-08 | 1988-02-26 | Ube Ind Ltd | Production of magnesia powder resistant to hydration |
-
1988
- 1988-08-10 AT AT2006/88A patent/AT392464B/en not_active IP Right Cessation
-
1989
- 1989-08-03 DE DE8989890206T patent/DE58904128D1/en not_active Expired - Fee Related
- 1989-08-03 KR KR1019900700747A patent/KR900701660A/en not_active Application Discontinuation
- 1989-08-03 AT AT89890206T patent/ATE88446T1/en not_active IP Right Cessation
- 1989-08-03 JP JP1508668A patent/JPH064487B2/en not_active Expired - Lifetime
- 1989-08-03 AU AU40636/89A patent/AU619885B2/en not_active Ceased
- 1989-08-03 ES ES198989890206T patent/ES2040503T3/en not_active Expired - Lifetime
- 1989-08-03 EP EP89909119A patent/EP0404867A1/en active Pending
- 1989-08-03 EP EP89890206A patent/EP0354896B1/en not_active Expired - Lifetime
- 1989-08-03 BR BR898907050A patent/BR8907050A/en not_active Application Discontinuation
- 1989-08-03 US US07/490,572 patent/US5106608A/en not_active Expired - Fee Related
- 1989-08-03 WO PCT/AT1989/000069 patent/WO1990001460A1/en not_active Application Discontinuation
- 1989-08-08 ZA ZA896027A patent/ZA896027B/en unknown
- 1989-08-08 CA CA000607716A patent/CA1334156C/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9001460A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AT392464B (en) | 1991-04-10 |
| EP0354896B1 (en) | 1993-04-21 |
| KR900701660A (en) | 1990-12-04 |
| JPH03501380A (en) | 1991-03-28 |
| ATA200688A (en) | 1990-09-15 |
| EP0354896A2 (en) | 1990-02-14 |
| BR8907050A (en) | 1991-01-02 |
| AU4063689A (en) | 1990-03-05 |
| EP0354896A3 (en) | 1990-03-14 |
| ZA896027B (en) | 1990-05-30 |
| WO1990001460A1 (en) | 1990-02-22 |
| DE58904128D1 (en) | 1993-05-27 |
| ATE88446T1 (en) | 1993-05-15 |
| JPH064487B2 (en) | 1994-01-19 |
| CA1334156C (en) | 1995-01-31 |
| AU619885B2 (en) | 1992-02-06 |
| ES2040503T3 (en) | 1993-10-16 |
| US5106608A (en) | 1992-04-21 |
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